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Discuss Fitting a Surrey Flange on a hot water cylinder in the Fittings & Pipes area at UKPlumbersForums.co.uk.

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  1. Paul Cockhill

    Paul Cockhill Member

    HI everyone

    I am having a problem removing a fitting from a Hercal Hot water cylinder. I ned to undo the fitting at the top to fit a surrey flange. It seems stuck fast. What is the best way to unscrew it?
    I am afraid of splitting the tank. I have tried " Crack it" spray which usually works in loosening a tight connection but this has made no difference.

    Any help greatly appreciated.

    Thanks
    Paul

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  2. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    Heat it up first bud should work remove a bit of the insulation though . kop
     
    • Agree Agree x 2
  3. Last Plumber

    Last Plumber Plumber GSR Top Contributor!!

    If you are meaning that you would like to remove the nut in the photo?

    Cut it or drill it and split it!
     
  4. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    Its a 3/4 bsp male iron to 22mm compression straight so not suitable to do the above , a bit of heat will shift it. Cheers Kop
     
  5. Last Plumber

    Last Plumber Plumber GSR Top Contributor!!

    Why not suitable?
     
    Last edited: Oct 16, 2017
  6. Last Plumber

    Last Plumber Plumber GSR Top Contributor!!

    Having looked closer, I think KOP is right there. My apologies.

    At first glance I thought it was a back nut
     
    • Friendly Friendly x 1
    Last edited: Oct 16, 2017
  7. spanner

    spanner Plumber GSR

    Be careful not to spray too much of the WD as it's all over the insulation.
    This could degrade the jacket and the foam.
    Doesn't look too bad.
    Alternative safest way
    Use a deep socket and an L bar
    Or a decent pair of adjustable.
     
  8. spanner

    spanner Plumber GSR

    Use wire brush to clean off most of the jet white from around the union
    This should make it easier.
    Also get a good square grip with the wrench..
     
  9. Chalked

    Chalked Plumber GSR

    Save time and fit an Essex flange o_O
     
  10. spanner

    spanner Plumber GSR

    As above
    Looks like it's filled with boss white.
    Once that stuff grips it's kinda permanent.
    Go for the Essex flange mate
     
  11. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Always a pain to get out mate. Have you done it now?
     
  12. spanner

    spanner Plumber GSR

    Yes have come across a few times
    Don't use it myself
    But can be a right pain in the backside.
     
  13. Best

    Best Trusted Plumber Top Contributor!!

    Make sure the water is out of the cylinder, or certainly much lower than the top connection. Then just needs careful heat with torch and good grips to remove it.
    That is a grade 4 cylinder and not much strength to it. I believe minimum standard is grade 3 now and grade 4 no longer used.
    I wouldn't use an Essex flange with its rubber joints.
     
  14. Paul Cockhill

    Paul Cockhill Member

    Many thanks everyone for your useful tips. I am not doing it until next week. Will take your advice and carefully use heat and patience.

    regards

    Paul
     
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